Method of forging yokes



1 A. LAMONT AND A. WALCHER. METHOD OF FORGING YOKES.

APPLICATION FILED AUQZZ. I919.

Patented Oct. 10, 1922.

2 SHEETS-SHEET I.

KN W

J. A. LAMGNT AND A. WALCHER,

METHOD OF FORGING YOKES. APPLICATION FILED AUG.22. 1919.

Patented Oct. 10, 1922.

2 SHEEIS-SHIET 2.

which I Patented on. 1c, 1922.

mp stares rarsnrorrica JOHN LAMONT AND ALFRED WALCHER, OF CHICAGO, ILLINOIS, ASSIGNORS TO AMERICAN STEEL FOUNDRIES, OF CI-IICAGO, ILLINOIS, A CORPORATION OF NEW JERSEY.

METHOD or ronerneyoxns.

Application filed August 22,1919. Serial No. 319,113.

' To all whom it may concem;:-

Be it'known that we, JoHN A.-LAMoN'r invented certain new and useful Improvements' in Methods of Forging Yokes, of which the following is a specification.

This invention relates to a method of' 10 forging yokes.

One of the objects of the invention is to improve and simplify the method of making yokes.

Another object is toforge yokes by a l5 novel and practical method to meet thevarious commercial-requirements.

I These and other objects are accomplished by means of the method illustrated on the accompanying sheets of drawings, in

Figures 1 and 2 views at right angles with respect toeach other, of a die with a blank. placed therein, before receiving any pressing-action;

Figures 3 and at are similar'sectional views of the die showing the blank therein 1 after having been given a slight pressing action by Ineansof a plunger filling the upper part of the die;

Figures 5 and 6 are similar sectional viewsv has been subjected to pressure by another plunger for forming the arms of the yoke;

Figure 9 is a fragmentary side elevation of the yoke after the hooded end thereof has had portions thereof sheared ofi' Figure 10 is a similar view, showing the hooded end of the yoke after the same has been provided with apertures;

Figure 11 is a fragmentary side elevation and Figure 12 is a top plan view of the yoke after an internal shoulder has been removed therefrom; and

Figures 13 and-14 areatop plan view and,

a side elevation, respectively, of the com pleted yoke.

The various novel features of the inventionv will be apparent from the following description and drawings, and will be parare vertical sectional portion of the H ticu-larly pointed out in the appended claims. i

y The entire'yoke is in one piece and formed from a single blank, the blank preferably being cut from a suitably shaped ribbon of metal, the blank then being heated to a good forging temperature, so that the metal will readily flow when subjected to pressure After the metal blank isheated, the latter is placed in a die andis subjected to pressure by a plurality of different plungers for properly shaping the rear end of theyoke,

punched and trimmed All ofthese operations may be accomplished by one or two heating's of the metalforming theyoke.

Referring to the figures of the drawings, and particularly to igures 1 to 8 inclusive, it will be noted that we have shown a die 10, the vertical sections of which are taken at right angles with respect to each other. For example, Figure 1 shows the die 10,

v with itsnarrow portionin section; and Figure 2 shows thesame die with its broad poi- "ti'on' 'in sectionq The die is provided with oppositely arranged shoulders 11 for receivingthe shoulder portions 12 of the metal blank 13, which blank, if desired, may be a piece cut from a metal ribbon of the section shown in Figure 1.

It will be noted that the original section of the blank as shown in Figure 1 has upper and lower faces 14 and 15 respectively. parallel with respect to each other and also parallel with the faces of the shoulders 12, the sides 16 of the blank diverging upwardly from the shoulder portions 12 to the upper face 14. The lower portion of the die 10 has a bottom face 17, from which the sides 18 diverge upwardly, terminating in vertical parallel side faces 19, which join the shouldors 11, from which side faces 19 diverge upwardly, terminating in vertical faces 20.

In the other section of the die, as, shown in Figure 2, the side faces 21 are vertical substantially throughout their length and terminate at the bottom in elliptical curves 22 which form corners of the die.

Themetal blank 14:, heated to theproper temperature, is placed in the die 10, as shown in Figures 1 and 2, whereupon a plunger 23, filling the entire upper opening of the die, descends upon the blank 14, subjecting the 'then forming the hoodfan'd then forming the arms, after which the yoke is sheared,

latter to pressure and forcing the metal down into the extreme lower end of the die to form the curved rearend 2st of the yoke, and otherwise pressing the blank snugly against all surfaces of the die, as shown in Figures 3 and 4. A differently shaped plunger is then forced down into the blank 13, causing the sides of the blank to,

' in Figure-s5 and 6.

A rectangular prismatically shaped plunger wider in one direction than the other and has a sliding ht with the die slde wall .19 and with theinner sides of the arms 28 isthen pressed downinto the die and into engagement with the blank, causing the metal to flow upwardly around the plunger and along the sides of the die to form the upper and lowerarms 28 ot the yoke, as shown in Figures 7 and 8. The side plates 26 then have their triangular portions 26 trimmedoff as shown in Figure 9; whereupon, said side plates 26 are punched to provide the usual registering openings 29, as shown in Figure 10. The shoulders 30 formed in thehood of the yoke, as shown in Figures 5 to 8 inclusive, are then punched or sheared, leaving clean interior portions Wlt-hOHlZ obstructions, as shown in Figures 11 and 12, the completedyoke being shown in Figures and 1 4.

In this method of forming a yoke, but a single blank is used to form an integral structure, including the arms andhooded portion and their connecting parts.

It is our intent-ion to cover all inodiiications of the method falling within the spirit and SCOPEOTE the following claims.

We claim:

1. The method of forging a yoke which consists in mounting a blank in a die, forcing the metal of said blank snugly against all surfaces of said .die and then forcing plunger into said blank, causing t 1e sic es 0' said blank to flow around said plunger to form-the hooded end of said yoke.

2. The method of forging yoke which consists in mounting a blank in a die, torcing the metal of said blank snugly against all surfaces 01 said die and then forcing a plunger into said blank, causing the sid s ot said blank to flow around said plunger to form the hooded end of saidyoke, and then pressing a rectangular, prismatically-shapcd plunger into said dieand into en; genient with the blank to cause the metal to flow around the plunger along thesidcs oi the die to form the upper and lower arms of said yoke. i

8. The method of forging a yoke which consists in heating a blank, subjecting. said blank to pressure between a die andvarious plungers to shape the rear end of the yoke, the hoodandthe arms, than. shearing the yoke, punching and trimming same.

Signedat Chicago, Illinois, this 19th day of August, 1919.

JOHN A. Laiionn ALFRED wALonnie. 

